Emergency brake device.



W. V. TURNER.

EMERGENCY BRAKE DEVICE.

APPLICATION FILED APR. 17. 1915.

1,199,839. Patented Oct. 3,1916.

WITNES SES INVENTOR ran sauras Mannr on WALTER V. TURNER, OF EDGEWOD, PENNSYLVA\IA, ASSIGNOR T0 TEE WESTING- HOUSE AIR BRAKE'COMJANY, OF WILMERDING, PENNSYLIANI, A CORPORATION OF PENNSYLVNA.

. EMERGENCY BRAKE DEVICE.

Specfication of Letters Patent.

Patented Oct. 3, 1916.

Application fi1ed April 17, 1915. Serial No. 21,977.

Edgewood, in the county of Allegheny and State of Pennsylvania, have invented new and useful Improvements in Emergency Brake Devices, of which the following is a specification.

This invention relates to fiuid pressure brakes, and more particularly to a brake apparatus for securing a high braking power in an emergency application of the brakes.

'Ihe principal object of the invention is to provide an improved brake controlling valve device adapted for supplying fiuid to one brake cylinder in service applications of the brakes and to two brake cylinders in an emergency application of the brakes. 7

In the accompanying drawing; Figure 1 is a diagrammatic view of a car air brake equipment employing tWo brake cylinders and shovving the improved brake controlling valve device connected up; Fig. 2 a central sectional view of the brake controlling valve device, with the parts in normal release position; and Fig. 3 a similar vivv, showing the parts in emergency application position.

The brake controlling valve device may comprise a casing 1 having a piston chamber 2 containing a piston 3 and connected to brake pipe 4, and a valve chamber 5 connected by pipe 6 with an auxiliary reservoir 7 and containing a main slide valve 8 and graduating slide valve 9.

A restricted passage 10 leads from the scat of the main slide valve and communicates with pipe 11, opening into the service brake cyli1ider 12, said passage providing communication through which fluid is supplied to the service brake cylinder in a service application of the brakes.

The emergency brake cylinder 13 is connected by a pipe 14 with a passage 15 and a valve piston 16 is provided for controlling the admission of fluid from a supplemental reservoir 17 to thebrake cylinder,

the valve piston 16 being adapted to control and a valve 23, contained in valve chamber 24:, which may be connected to a chamber 25, for increasing the volume of the valve chamber.

Accordingto 1ny invention, fiuid is suppl1ed to the service brake cylinder through a restricted passage in a service application of the brakes, while in an emergency application of the brakes, a large direct comv munication is opened for quickly supplyin fluid to the service brake oylinder. Forthi purpose a piston 26 is provided for operatmg a valve 27 adapted to control a large port opening -frompassage 28, leading to the" auxiliary reservoir 7.

In operation, fluid under pressure, supplied to the brake pipe 4, fiows from piston chamber 2, through the usual eed groove 29 around the piston 3, and charges valve chamber 5 and the auxiliary reservoir 7. Fluid also fiows through passage 30,v containing check valve 31, and charges the supplemental reservoir 17. The emergency valve chamber 24 and the connected chamber 25 are charged from the brake pipe through feed groove 32 around emergency piston 20. In the. normal release position of the parts, as shown in Fig. 2, the service brake] cylinder 12 is connected to exhaust port 33 through passage 10, port 34, cavity 35 in graduating valve 9, and port 36. The ornergency brake cylirider 13 is connected to an exhaust port 37, through passage 15 and cavity 38 in the emergency slide valve 23.

If a service application of the brakes is desired, a gradual reduction in brake pipe valve device is 01: the type adapted to make full traverse in both service and emergency application of the brakes, the piston 3* is then shifted to its outer scat and the service port 39 is brought into registry with passage 10. dluid is therefore supplied from the auxiliary reservoir to the service brake cylinder through the restricted passage 10, the emergency parts not moving. Upon a sudden reduction in brake pipe pressure, the equalizing piston moves to application position as in service and in addition the emergncy piston 20 moves out by reason of the reduction in brake pipe pressure at a greater rate than equalization can take place through the eed groove 32. In emergency position, as shown in Fig. 3 of the drawing, a passage 40 is connected by cavity 38, in;

the emergency valve 23; with exhaust port 37, so that fiuid under pressure beloW the valve piston 16 is vented to the 'atmosphere and this permits supplemental reservoir pressure acting on the exposed portion of the area of the valve piston, to lift same from its'seat and thusestablish communication from the supplemental reservoir to the emergency brake cylinder 18. Fluid supplicd from the supplememtal reservoir to the emergcncy brake cylinder also fiows through passage 41 to the chamber ab0ve piston 26 and said piston is thereupon shifted so as to open the valve 2? and provide a large direct communication ior supplying fiuid from the auxiliary rese1voir to the service brake cylinder 12. It Will thus be seen that in an emergency application of the brakes, fiuid from the auxiliary reservoir rapidly equalizes into the service brake cylinder, so that the full equalized pressure is qu-ickly seeured in both brake cylinders;

In releasing after an emergency applicatiOh,the brake pipe pressure is increased, so that the equalizing piston 8 is shifted to release position and the slide valves 8 and 9. are operaced thereby to connect the service brake cylinder With the exhaust port 33. In order to insure the prompt, positive move ment et the valve piston 16 to its closed position, the passage iO is connected by a cavity 4-2, in the main slide valve 8, with a passage 43 leadingto passage 30, so that fiuid from the supplemental reservoir is supplied to the sp1ing side of the valve piston 16. The con sequent equalization of fluid pressures upon opposite sides of the valve piston, permits the spring 44 to move same to the closed position.

In order to facilitate the release movement of the emergenoy-valve mechanism, the valve chamber 24 is connected in the emergency position with passage 41, so that the pressure in said valve chamber Will then reduce to the qualized pressure in the emergency brake cylinder. The brake pipe pressure may then be readily increased t0 a higher degree than that acting in valve chambcr 24 and consequennly the emergeney piston 20 is promptly shifted t0 release position. ln release position of the emergency valve 23, the emergency brake cylinder 13 is connected to the exhaust port 37 and also the chamber above the piston 26, so that said piston and the valve 2? are shifted to the normal closed position.

Having noW described my invention, what I daim as neW and desire to secure by Letters Patent, is:

1. In a fiuid pressure brake, the combination with a brake cylinder and means for supplying fluid to said brake cylinder to effeot a service application of the brakes, of an emergency brake cylinder and a valve device operated by the floW of fiuid to the emergency brake c vlinder for supplyng fluid to the service brake cylinder.

2. In a fiuid pressure brakc, the combinaftion With a brake cylinder and means for fiuid to said brake clinder to eEect a service application of the brakes, of an emergency brake cylinder, an emergency valve mechanism operated upon a sudderi reduction in brake pipe pressure for effecting the supply of fiuid to the emergency brake cylinder, and means operated by fiuid supplied to the emergency brake cylinder for oPening a large direct port for supplving fluid to the service brake cylinder. v

4. In a fiuid pressure brake, the combination with a brake cylindcr, brake pipe, auxiliary reservoir, and triple valve device operated upon a gradual reduction in brake pipe pressure for supplying fluid through restricted port from the auxiliary.reservoir to the brake cylinder, of a supplemental rescrvoir, an emcrgency brake cylinder, an emergency valve mechanism operating upon a sudden rednctionin brake pipe pressure for etecting the admission cf fiuid from the sup plemental reservoir to the emergency brake Cylinder, and a piston and valx eopcrated by the fiow of fiuid to the emergency brake cylinder -for opening a large port for supplying fluid to the service brake cylinden 5. In a fiuid pressure brake, the combination with a service brake cylinder and a triple valve device for controlling the admission et fluid to said brake cylinder in a servicc application of the brakes, volE an emergency brake cylinder, an emergency valve meehanism for controlling the supply of fluid to the cmergeney brake cylinder, and .1cans subject to the pressure in the emergeney brake cylinder for controlling the admission of fluid to the service brake cylinder in an emergency application of the brakes.

Intestimony whereof I have hereunto set my hand.

WALTER V. TURNER. Witnesses:

A. M. CLEMENTS, S. W. KEEFER.

C pp1eeot chie patent may be obtained for five cents each, by addressng the Commissioner of -Pacena 'Wasbngtom, D. C. 

